Vegas 6.0 Problem

Hey all.

I've been having some trouble with Vegas 6.0 lately, and it's the "Media Offline" problem. Every time I start a new project, save it, exit Vegas and start it up later on in the day, it keeps telling me this:

An error occurred while opening the media file.
The file could not be located.

Everything else in my project works, audio and several still images, but whenever videos are involved this message keeps popping up and I've tried everything to resolve this issue (Installed K-Lite, unchecked the 'Close media files when not active application') but the only thing that seems to prevent this from happening is if I uninstall and install QuickTime every time before I start up Vegas. The only problem is QuickTime is not that fast to install and takes some time.